Open .fits Files Online Free — No Software Needed
Open FITS File Online — Free & Instant
No signup required. Works in your browser.
📁 Drag & drop your file here
or click to browse • Max 100MB
✅ Free • ⚡ Instant • 🔒 Secure • 💻 No install
What Is a .fits File?
FITS (.fits) is a science file format. FITS stores astronomical image and table data. It is commonly used by professionals and created by NASA/IAU.
Step-by-Step: How to Open .fits Files in 2026
Follow these steps to open any .fits file online without installing software:
- Go to OpenAnyFile: Navigate to openanyfile.app
- Upload: Drag and drop your .fits file or click Browse
- Auto-detection: The system identifies the FITS format using signature analysis
- View: Open and inspect the file contents in the browser
- Analyze: Use AI-powered analysis to understand the file structure and metadata
- Convert: Optionally convert to PNG, JPG, CSV
Software That Opens .fits Files
Windows
NASA/IAU can open .fits files natively on Windows. Alternatively, use OpenAnyFile for instant browser access.
macOS
macOS may not natively support .fits files. Use the original application or OpenAnyFile.
Linux
Open-source alternatives or OpenAnyFile provide .fits support on Linux.
Mobile (iPhone & Android)
OpenAnyFile works on all mobile browsers — no app download required.
Common Problems Opening .fits Files
- Your OS doesn't recognize the .fits extension
- The file appears corrupted after downloading
- You don't have NASA/IAU installed
- Specialized format for astronomy.
OpenAnyFile bypasses all these issues with universal format detection that works in any browser.
Convert FITS to Other Formats
Frequently Asked Questions
What is a .fits file?
A .fits file is a science format called FITS. FITS stores astronomical image and table data.
How do I open a .fits file without installing software?
Upload your .fits file to OpenAnyFile. Our browser-based tool instantly detects and displays it — no downloads needed.
What program creates .fits files?
.fits files are typically created by NASA/IAU.
Can I convert .fits to another format?
Yes. OpenAnyFile converts .fits to PNG, JPG, CSV, TIFF.
Is it safe to open .fits files online?
Yes. OpenAnyFile processes files in a secure, isolated environment. Files are automatically deleted and all transfers use HTTPS.
Can I open .fits on my phone?
Yes. OpenAnyFile works on all mobile browsers including iPhone and Android.